Hydraulic pot press



Nov. 19,1929, .P.HANEL 9 Q .9 1,736,262

HYDRAULIC POT rnEss Filed Nov. 29,1926 :s Sheets-Sheet 1 No 19, 1929. IP. ANEI;

HYDRAULIC POT PRESS I Filed Nov. 29; 1926 3 Sheets-Sheet 2 Fatented Nov19 1929 PAUL HKNEL, OF DRESDEN-A, GERMANY HYDRAULIC POT PRESSApplication filed November 29, 1926, Serial No. 151,511, and in GermanyDecember 15, 1925.

My invention refers to so called hydralic pot presses for removing theoilfrom cocoa powder and for other similar purposes; In these pressesseveral sets of press pots which are open on two sides, and plunger likepress heads which are consistent with intermediate guiding plates, arepiled the one upon the other along vertical guiding bars so as to form avertical column between a lower hydraulic pressand an upper cross head.For the op- 15 press pots by the hydraulic press. For charging anddischarging the press pots the different sets are distanced from eachother and the press pots are removed of the machine by sliding themlaterally.

It is the purpose of my present invention to relieve the considerablework of repeated screwing and unscrewing each single set of thehydraulic press by providing automatically acting springs between thediiferent pieces of the different sets of press pots all those springsbeing set to Work or released by a common regulating device with a handwheel.

In the drawings wherein I have shown a preferred embodiment of theinvention, and

in which similar reference characters designate corresponding partsthroughout the several views,-

Figure 1 is a vertical longitudinal section of a press constructed inaccordance with my 3:, invention taken substantially on the line 11-similar to Fig. 1, showing the press pots in closedposition 1 Fig. 4 isalso a vertical section similar to Y Fig. 1 showing the relativepositions of the parts at the end of the pressing operation;

Fig. 5 is a like vertical sectional view showing the relative positionsof the parts after the hydraulically operated means has returned tonormal postion and the press cakes I ha e been ejected from the pots,and

Fig. 6 is a detail sectional view of a slightly modified form of a partof the machine.

In the embodiment of my invention shown in the drawings the socle 22containing the hydraulic press 23 is connected with the cross head 24 byuprights 25, the shoulders 26 of which limit the downward sway of theintermediate plates 27 and 27 bearing the press heads 28 and 28 whereasthe plate 27 with the press head 28 rests directly on the hydraulicpress 23. The coiled springs 29, subject to pressure tension, areinserted between the fiangeof the intermediate plates 27*, 27", 27 andthe slide blocks 30 of the press pots 31, 31 and 31 As however in thiscase the springs 29 are inserted between the press heads and the presspots of the same set, they act so as to press each press pot with itsupper cover plate against the lower fact of the next higher press setrespectively against the upper cross head of the machine. Thisarrangement has the advantage that the pressing actuation of thehydraulic press on the columns of the pot press sets compresses likewisethe coiled springs 29, so that the latterincrease at the same time thetightening pressure between each press pot and the next higherintermediate plate. The vertical pressure rods 32 are arranged in thecentral plane of the machine, said rods having a number of shoulders 33limiting the upward movement of the slide blocks'with the press pots.These. rods also serve-for adjusting the press pots to the rightposition with reference to the press top before startingwork with themachine. To this end the lower ends of the pressure rods are providedwith slots 34 and on the lateral flanges of the lowest intermediateplate 27 a there are slidable bolts 35, which if passed through the saidslots 34 secure the right position of the rods 32, whereupon the boltsmay again be drawn out of the said slots, so as to give the rods freedomfor their working movements, which theyj."v perform when the machine isactuated. The reciprocating shifting of the bolts 35 is done by themeans of a rack and crank, device 36, indicated in the figures by dottedlines. The upper ends of thepressure rods 32 are shaped asplungerpistons 37 which slide in the cylinders 38, free as longas the hydraulicpress 23 is W01king on the press sets, whereas when the hydraulic presshas fiinished its work and releases the press sets, the plunger pistons37 are driven downwardly by hydraulic pressure coming through theconduits 39.

Now as to the working process ofthe machine, Figure 1 shows the positionof all parts ready for starting the work: the press pots are filled andinserted into their slide blocks and are held in suspension by thetensioned springs 29; they cannot touch the next higher intermediaryplate, because their slide blocks 30 are held down by the shoulders, 33,the pressure rods 32 being held down by hydraulic pressure in thecylinders 38. The machine startsworking by releasing the pressure out ofconduit 39 and cylinders 38. The tension of the springs 29 is thusallowed to lift the slide blocks 30 with the press pots, pressing thelatter tight against the next higher intermediate plate respectivelyagainst the cross head, as it is shown. in Figure 3. The hydraulic press23 starts work and presses the press heads 28", 28", 28, into the presspots 31, 31 31 compressing at the same time the springs 29, so that theyhelp to press the press pots tighter to the next higher intermediateplate, respectively to the cross head, as it is shown in the Figure v4:.The squeezing process then being finished the bolts 35 are withdrawnfrom the slots of the pressing rods, the hydraulic press 23 isdischarged, but pressure is given through the conduits 39 to the plungerpiston cylinders 38, which presses down the pressure rods. The presspots are engaged by the shoulders of the pressure rods and are pulleddown likewise over the press heads until the latter press the presscakes out of the press pots, as it is shown in Fig. 5. Then the presscakes are removed, the parts of the machine are brought into theposition of Figure 1 with empty press pots however, the press pots arepulled out laterally in the slides of the slide blocks 30, to berefilled and reblocks and having shoulders bearing against said blocks,so as to pressthe press p ots away from the next higher intermediateplates, means for controlling the movement of the said pressure rods;means for temporarily locking the pressure rods with the lowermost ofthe intermediate plates.

2. In a hydraulic pot press a plurality of press pots and a press headcooperatively associated with each pot, said press pots and headsalternating with each other in vertically superposed relation, saidpress heads having guidingfianges at opposite sides thereof, a singleguide rod at each side of the press pots and press heads movable withand independently of the latter, coiled springs arranged between each ofthe press pots and the guiding flanges of the next lower" press head, anhydraulic press for moving the press heads into the respective presspots the said guide rods partaking of such movement, an additional meansfor moving the guide rods in the opposite direction, said guide rods andthe press pots having cooperating parts whereby the press pots are moveddownwardly upon the respective press heads to eject the press cake fromthe pot.

' In testimony that I claim the foregoing as my invention, and havesigned my name hereto.

PAUL HANEL.

entered into the machine, whereupon the working process can start again.

Figure 6 shows a modification of the driving means of the pressure rods,according to which modification the upper ends 40 of the pressure rods32 are connected by a traverse 41 which. is connected with thereciprocating rod and hydraulic piston 42. This construction has theadvantage of insuring equal movement for the pressure rods on both sidesof the machine.

I claim:

1. In a hydraulic pot press the combination of: a hydraulic press; apress head; a plurality of press pots with sliding blocks; intermediateplates having press heads for the press pots and having lateral guidingflanges; coiled springs inserted between the

